Please consider to add more support on the frame works in order to be able to support all the newly added wood logs on the upper floor. Please remember to get some professional Architect to take a look and comment accordingly. So worries about the safety. The lower frame works don't look so strong or is it strong enough to support the added weights from those heavy logs???
first you need to have a plan how you going to renovate the old house, if the structure safe, the roof, the wall, will you be able to do most work yourself ? are you able to do it ? the way you hire neighbour to help, very cowboy job, won't last,you have a big dream but just as dream, hope it will come true.